Press for the cold extruding of tubes from metal disks



July 3, 1928. 1,675,676

. E. WALTHER PRESS FOR THE COLD ,EXTRUDING 0F TUBES FRO! IETAL DISKS Filed Jan. 15, 1927* Z'ShQets-Sheet' 2 i iii V aw Patented July 1928.

UNITED. STATES nwnfn wan'rnnn, or nuanncn, nanmv, enmam," I

'ranss rort rm: corn nx'raunme on runs rnou mare-n msxsljff Application flledlanuary 15,1927, Serial no. 101,454, and 1a Germany much- 12, 1995.

This invention relates to a press designed for the cold-extruding of tubes from a metal disk by means ofa pressing plunger and a mandrel, as well as a matrix, in which a disk that arrives automatically in front of the aperture of the matrix is perforated by the v mandrel and then subjected to thepressure of said plunger in such a manner that the tube-forming material is pressed out between outer wall of the plunger, there the outer wall of the plunger and the inner wall of the matrix, counter to the feed movement of the mandrel, over and alon the emg formed simultaneously therewith a hollow neck which is threaded later on. l

The gist of the invention resides in the I first place in the ,fact that the mafidrel which is gulded in' the plunger is withdrawn by. a-

. suitable mechanism as soon as both members,

together with the tube, have left the matrix, whereby the new effect is attained that air can pass into the interior of the tube prior to its being stripped off from the plunger so that a vacuum which would entail 'destruction of the tube at the high speed of the extrudingprocedur'e' (50-60 revolutions of the machine in a minute) cannot arise. v The invention 1s lllustrated 'dla ammatically and by way of exam le on t e 110-. companying drawings on whic Figure 1 is partly a side-view of, and partl an anal section through, the mechanism, t e plunger being in its operative position; Figures 2,

and 3 show the same members as in Fig. 1

in other positions, the frame also shown in Fig. 1 being omitted in .these figures (2 and 3) Figure 4 shows in plan and in side-view vone of, the metal disks used for the manu- 'iacture of the tubes; Figure 5 is a crossplane 5-5 ofFig. 1, seenection inthe from the leftto the right, and shows the conveying means for-the tubes made;'Figure -6 isa vertical longitudinal section through V the matrix, the man'dreh'the plunger, find a sprayed tube, these parts,,. except the matrix, being broken off attheirleft-hand ends;

Figure 7 shows the same parts as in Fig. 6-,

in such other;position that air can enter into the tube, and-{Figure 8 is a'view simivlar to Fig. .3, but showsa modification.

The details of the pressare as follows: I

A 1-3) denotesgthe main shaft, to'

i secured a disk-provided with a- I teral-apin' s? bearing a connecting rod K nected atk'- 'Iwith the members a and e toggle-jointglever. The member a, is

and l the plunger; the;

end of the plunger isgof conical lever fulcrumed on the pivot 'n/ and contact- :below these parts,

hinged at e to the shown at Z in Fi sl Bland 7:? p 4 The lever mem er, :e is provided with a downwardly directed lug 0 extending through recesses o I off-the sliding members i and h. The lug..o. conta cts with a roll carried by the slid-ingmember h. This to engages a cavity '0 of said lug when these parts are, in the osition shown in Fig. 2.

The matrix b is located in the frame B the ress; its shape-a pears-,;from Figs. 6' and Just in front 0 .thesame terminates a guide channel a (Fig. 51); throughwhich are supplied the metal disks 0 (Fig, 4geservmg for the manufacture-pf the tu s. 9 denotes a stripping member formed b trally perforated disk. inis abe l-crank ing at its upper end;- with a downwardly?" directed projectionh' of the sliding member. k, and at its lower end with which it is oscillated; when the shaft A is rotated. ..Between the {endqof the supply i} at channel a and the stripping member g,';

is located -an endless eon veying band r (Figs. 1 .3 and ,5) by whic the tubes 9 made in; the pressiare carried awn. I "t Elie manner of operation of the pressig asj fo o'ws:

. In the positiontofthe partsin Fig. 1' the -i toggle-joint lever-e-e' .is stretchedtandlthe1 two sliding members are therefore, in their utmost position to the rlght, which 'is true,

of course, also of the mandrel k and .thefiie' Z, their position relatively to the matrix be-: ,J Figs. 1 and 6.1Priors ing now that shown in thereto, that isto say,

it and said tools It and l and centered b suitable means, and when then these. too are shoved to the right, into the position no shown in Figs. 1 and 6, the diskis pierced.

p I 1,675,676 PATENT (oi-"rice.

a cam mfb before the plunger and the mandrel had been moved to the right (without any movement relativel to eachother) a metal disk 0 (Fig. 1)'had n placed in front of the matrix, i. e. between thread for the reception. of the closing cap. cams w and tubular portion g? is formed around thq member h. The toggle-joint lever y is conhole, that tubular portion formin afternected by a rod '0 with one arm of a threewards the neck of the tube inade in t e press. armedlever u fulcrumed on the bolt a; the and being then provided with an exterior other two arms of this lever are rocked by w. When the crank shaft "S S -is The. matrix I) is, of course, shaped accordrotated in the direction indicated by the ingly. 3 arrow in Fig. 8, the toggle-joint lever e e' The shaft rotates in the direction indiwill be stretched practically in the same mancated-by the arrows in Figs. 1-3, and'when ner as in 1 after the crank shaft S S it has performed a part rotation of about 60 has made one half of one revolution, the

degrees (from the position Fig. 1) it com guide bodies being thereby moved into their mences to lift the toggle-joint lever members pressing position. The; Sma loggle-level e 6 whereby the two sliding bodes h and i 1 which actuates the mandrel-and is moved are withdrawn from the matrix, together by the rod '0, the three-armed levenu, and

with the formed tube portion upon them. the cams wand 41:, remains stretched while whereby the slidin and-the toggle-joint lever 0 When the angular .motion of the shaft the other toggle-lever (e e) is being mounts to nearly ninety degrees, the position stretched as just described.

of the lug 0 relatively to the roll p is such When the tube has been extruded, as in that, this latter can engage the cavity 0 Figs. 1 and 6 and been withdrawn from the body i is shifted a little matrix b by the rearwardly mgving guide relatively to the sfiding body h, as is, conbodies 11 an ,or by the tools Z and k res ec-. sequentl also, the mandrel rela ively to the tively, the toggleoint lever y Wlll be ent die, ass own in Figs. 2 and 7. he pointed 0 through upwardly by the parts to a" of the end of the mandrel has now left theneck g, cams w and m, the lever u, and the rod 1;,

- 25 and air can enter into the tube. The bellwhereby the mandrel k is withdrawn so crank lever n has not yet been moved because much that, just as in Figs. 2 :tnd 7, atmos-' its lower arm has not yet been actuated by pheric air can enter between the outer ed the cam m. of the die Z Z and the inner wall of the tu The rotation of the shaft A is continued 9 g so that the tube can be stripped off e lifted by and quickly and automatically without any-damby into the position shown in Fig. 3, 1n conage o. i According to the length of the sequence whereof the lug 0 is so much lifted cam portions w and w the mandrel it re. that its cavity 0 leaves the roll whereby mains withdrawn .for a shorter or long er another movement of the two sli ing bodies time, and can then be brought anew into its relatively to each other is caused, their popressing position at any desired or required sition with respect to one another being new tune. the same as in Fig. 1, but both sliding bodies having finally arrived .in their utmost lefthand position. 1

While the sliding bodies It and i have a stationary matrix having a cavity shaped covered .the way from the right to the left, according to the head and neck of the hi es also the tools is and Z have covered the same to be formed, and ada ted to e'xtrude rearway "and the plunger 1 has com letely left wardly the surplus tu e forming material; the stripping member 9. The diameter of a plunger shaped according to the tube body the central hole of this member is a little and serving as a carrier for the extruded smaller than the outer diameter of the tube, tube material; a mandrel extending throu hand the tube is, therefore, stripped off the out said plunger and having a pointed ee plunger when this latter is moved from the' hdadapted to form an opening through the ri ht to the left, as described. The strippedneck and head of the tube means to shift the '0 tube 9 falls upon the conveying band 1 plunger and mandrel, said means adapted at by which the tubes are conveyed to anotherfirst to introduce the plunger and mandrel workingplace or machine where the tubes into the matrix, then to withdraw the same are further treated and finished.

Instead of a stationary stripper, as a said means will set the plunger at rest and movable one or, more precisely a bipartite withdraw further the mandrel whereby to movable stripper, such as g g (Fig. 7), may permit air' to enter into the tube, said means I claim: 4 1 1 1. A press for the cold extruding of tubes In the modification shown Fig. 8, in wh1ch the position of the toggle-joint lever 5 and of the members h and i is the same as in Fig. 3, the movements .of these latter be used. nally withdrawingagain the plunger and mandrel' a stripping member riding over the mandrel; and means for conveying away the finished tubes.

2. A press for the cold extruding of from a metal disk comprising in combination p with the tube from said matrix, whereupon members relatively to each other are effected tubes from a metal disk comprisng in cofii v by means of\- another, smaller toggle-joint bination a stationary matrix having a cavity .lever y ointed at one end to the member 1" shaped according to the head and neck of 5 and at the other end to a cross-wall of the. the' tube to be formed, and adapted to ex- I trude rearwardly the surplus tube forming troduce the plunger and mandrel into the 15 material; a plunger shaped according to the' matrix, then to withdraw the same with the tube body, and serving as a carrier for the tube from said matrix, whereupon said extruded tube material; a mandrel extending mechanism will set the plunger at rest and throughout said plunger and having a withdraw further the mandrel, whereby to pointed free end adapted to form an opening permit air to enter into the tube, said mecha- 20 through the neck and head of the tube; a nism finally withdrawing again the plunger pair of sliding members mounted one withand mandrel; a stripping member riding in the other, one of said members being c0nover the mandrel; and conveying means for nect-ed to the plunger, and the remaining taking away the finished tubes. 7

member being connected to the mandrel; a In witness whereof I have hereunto set my 25 motion transmitting mechanism including a. hand.

cam and levers jointed to said sliding members, said mechanism adapted at first to in- EWALD WALTHER. 

